题目内容：

10春大学英语三作业
1.The police are trying to find out the ___ of the woman killed in the accident.
选项:
a、evidence
b、 recognition
c、 status
d、 identity
Before you leave,please ___ all the windows are closed.
a、A.sure
b、B.make sure
c、C.certain
d、D.assure
________________________________________
Mechanics ___ a concept in physics.
a、is
b、 are
c、 was
d、were

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